# 8: Remix

**Source**: https://cscircles.cemc.uwaterloo.ca/8-remix/
**Parent**: https://cscircles.cemc.uwaterloo.ca/

This lesson consists of several exercises that combine the different skills you learned in the previous lessons.

Coding Exercise: Python Adder

Write a program that takes a single input line of the form `«number1»+«number2»`, where both of these represent positive integers, and outputs the sum of the two numbers. For example on input `5+12` the output should be `17`. Hint 1Hint 2

You need to create an account and log in to ask a question.

S = input()
# delete this comment and enter your code here

You may enter input for the program in the box below.

|  |  |  |  |
| --- | --- | --- | --- |
|  |  |  |  |

More actions...
History
Reset code to default
Help

Coding Exercise: Substring Counting

As mentioned in lesson 7A, a substring is any consecutive sequence of characters inside another string. The same substring may occur several times inside the same string: for example "assesses" has the substring "sses" 2 times, and "trans-Panamanian banana" has the substring "an" 6 times. Write a program that takes two lines of input, we call the first `needle` and the second `haystack`. Print the number of times that `needle` occurs as a substring of `haystack`. Hint

You need to create an account and log in to ask a question.

# delete this comment and enter your code here

You may enter input for the program in the box below.

|  |  |  |  |
| --- | --- | --- | --- |
|  |  |  |  |

More actions...
History
Help

In the following question, once you get it correct we'll show you a graphical representation of the output using `*` graphics.

Coding Exercise: Watch the Pendulum

In physics, for a pendulum with length L and initial angle A, its horizontal displacement X(T) at time T is given by the formula

X(T) = L × cos(A × cos(T × √9.8/L)) - L × cos(A)

Write a program which takes two lines of input; the first line is L and the second line is A. The output should be ten lines, giving the values of X(0), X(1), X(2), ..., X(9). For example, if the first line of input is `53.1` and the second line of input is `0.8`, then the first line of output is `0.0` and the second line of output is 53.1\*cos(0.8\*cos(1\*√9.8/53.1)) - 53.1\*cos(0.8) ~ `2.6689`.

You need to create an account and log in to ask a question.

# import statement goes here
L = float(input())
A = float(input())
# delete this comment and enter your code here

You may enter input for the program in the box below.

|  |  |  |  |
| --- | --- | --- | --- |
|  |  |  |  |

More actions...
History
Reset code to default
Help

Coding Exercise: Centering Text

For this program, the first line of input is an integer `width`. Then, there are some lines of text; the line `"END"` indicates the end of the text. For each line of text, you need to print out a *centered* version of it, by adding periods `..` to the left and right, so that the total length of each line of text is `width`. (All input lines will have length at most `width`.) Centering means that the number of periods added to the left and added to the right should be equal if possible; if needed we allow one more period on the left than the right. For example, for input

```
13\
Text\
in\
the\
middle!\
END
```

the correct output would be

```
.....Text....\
......in.....\
.....the.....\
...middle!...
```

Hint

You need to create an account and log in to ask a question.

width = int(input())
# delete this comment and enter your code here

You may enter input for the program in the box below.

|  |  |  |  |
| --- | --- | --- | --- |
|  |  |  |  |

More actions...
History
Reset code to default
Help